His proposal described three simple ingredients. First, a way to identify documents with addresses that could include not just a machine but a path within it, which became the Uniform Resource Locator, the URL. Second, a language to describe how those documents should look and which parts of them linked elsewhere, which became Hypertext Markup Language, HTML. Third, a protocol to transfer those documents on demand, which became Hypertext Transfer Protocol, HTTP. Together, they formed the world wide web.Hypertext itself was not a new idea. People had been dreaming of linked, non linear documents for decades. What Berners Lee did was marry that dream to the existing internet and, crucially, make his system open. He did not patent it or charge license fees. Anyone could set up a web server and anyone could write a browser that could read pages. When he released the first browser and server in the early nineteen nineties, only a few hundred websites existed. The web was a toy used by physicists. Yet its logic was addictive.A web page could contain text, images, and links. Click on a link and the browser would fetch a different document, perhaps from a different continent, seamlessly. You did not need to know the path your requests took. You did not need to log into each remote computer manually. The browser and the underlying protocols did the hard work. For the first time, a person with no technical background could wander the internet by following their interests, moving from page to page as easily as turning pages in a magazine.Browsers improved quickly. In nineteen ninety three, a group at the National Center for Supercomputing Applications released Mosaic, one of the first widely used graphical browsers. Mosaic could display images inline with text, an apparently minor feature that made the web feel alive rather than academic. Within a year, commercial versions appeared, and the first primitive websites for newspapers, shops, and fan communities launched.Then something subtle but decisive happened. Until the early nineteen nineties, the backbone of the internet in the United States was still funded by government research networks, which mostly banned commercial traffic. In nineteen ninety one, that ban was lifted. Private companies began building their own internet backbones. Internet service providers started selling dial up connections to households. The sound of a modem screeching over a phone line became the audio logo of the era. Entities that had nothing to do with science or the military, from bookstores to bands to local chess clubs, created web pages.In less than a decade, the number of websites exploded from hundreds to thousands to millions. The internet stopped being a tool for a narrow elite and started turning into a mirror, however imperfect, of humanity’s obsessions. Recipes and conspiracy theories, academic papers and fan fiction, pornography and prayer circles, stock tips and support groups, all jostled for space on servers that now lived in office closets, data centers, and eventually anonymous warehouse sized farms.This transformation created a new problem that might be the most human of all. With so much information available, how did anyone find anything. Early web directories, curated by hand, tried to list interesting sites in categories like a digital phone book, but they quickly drowned in the flood. What the web needed was not a librarian, but a map that could redraw itself every minute.Search engines provided that map. Early ones like Archie and Veronica indexed file names and titles. Later ones, like AltaVista, started reading entire pages. The most revolutionary twist came from a student project at Stanford called Google, which took advantage of a fact baked into hypertext itself. Every time a page links to another, it is quietly voting that the other page is worth visiting. By counting and weighing these votes, Google’s algorithm could rank results not just by whether they contained certain words, but by how central they seemed to the web’s own structure.Search engines turned the web from an overwhelming sea into something people could navigate in seconds. You did not need to know the address of a weather site. You just searched for weather and clicked the first few results. Underneath, fleets of software crawlers, called spiders, roamed the web day and night, following every link they could find, building an index of billions of pages. The internet became not just a place you visited, but a place that watched and learned from your visits.By the early two thousands, another layer was forming on top of this already thick stack. At first, the web had mostly been read only. People consumed pages others created. Making your own site required some technical skill. As tools improved, that barrier fell. Blogging platforms let anyone publish essays in minutes. Photo sites let people share images with friends. Forums and message boards flourished.Then came services designed specifically to capture and amplify social connections. Friendster, MySpace, Facebook, Twitter, YouTube, and countless others turned up in rapid succession, each promising an easier way to connect with other humans through the network. The phrase social media had not existed when Kleinrock typed LO. Within thirty years, it would describe a multi trillion dollar ecosystem sitting on top of the same basic packet switching machinery.